Metric Modulations/ chord symbols/ and metronome Bugs/ saves lost

Hey,
i've come to rely a lot on musescore and since the update i cant add common metric modulation (like 2 old quarter note triplets equal one new quarter note). Some saved pieces just vanish without a trace not only on my musescore but also at some friends (most important matter!!!). The chordsymbols get played in random spots, and longer duration than written. and the metronom just keeps playing random syncopations or different tempi. it seems to me a lot has worsened to musescore 3